When am I able to talk to these characters

[Rozetheeuwu]

So according the relationship guide you can get an extra point with Shelly and Titania/Serra if you talk with them before going to Agate (This is before saving Agate City from team Meteor) Where exactly are they talking to each other? When you enter the house the cutscene starts playing and they all leave to Agate. (I know you have to talk to Shelly outside first)